<template>
  <div class="ebook" ref="ebook">
    <book-reader></book-reader>
    <ebook-title></ebook-title>
    <ebook-menu></ebook-menu>
    <ebook-bookmark></ebook-bookmark>
    <ebook-header></ebook-header>
    <ebook-footer></ebook-footer>
  </div>
</template>

<script>
import BookReader from '@/components/ebook/EbookReader'
import EbookTitle from '@/components/ebook/EbookTitle'
import EbookMenu from '@/components/ebook/EbookMenu'
import EbookBookmark from '@/components/ebook/EbookBookmark'
import EbookHeader from '@/components/ebook/EbookHeader'
import EbookFooter from '@/components/ebook/EbookFooter'
import { getReadTime, saveReadTime } from '../../utils/localStorage'
import { ebookMixin } from '../../utils/mixin'

export default {
  mixins: [ebookMixin],
  components: {
    BookReader,
    EbookTitle,
    EbookMenu,
    EbookBookmark,
    EbookHeader,
    EbookFooter
  },
  watch: {
    offsetY(v) {
      
      if (!this.menuVisible && this.bookAvailable) {
        if (v > 0) {
        this.move(v)
      } else if (v === 0) {
        this.restore()
      }
      }
    }
  },
  methods: {
    restore() {
      this.$refs.ebook.style.top = 0
      this.$refs.ebook.style.transition = 'all .2s linear'
      setTimeout(() => {
        this.$refs.ebook.style.transition = ''
      }, 200)
    },
    move(v) {
      this.$refs.ebook.style.top = v + 'px'
    },
    startLoopReadTime() {
      let readTime = getReadTime(this.fileName)
      if (!readTime) {
        readTime = 0
      }
      this.task = setInterval(() => {
        readTime++
        if (readTime % 30 === 0) {
          saveReadTime(this.fileName, readTime)
        }
      }, 1000)
    }
  },
  mounted() {
    this.startLoopReadTime()
  },
  beforeDestroy() {
    if (this.task) {
      clearInterval(this.task)
    }
  }
}
</script>

<style lang="scss" rel="stylesheet/scss" scoped>
  @import "../../assets/styles/global";

  .ebook {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
</style>